Sriharikotta, Andhra Pradesh:

Addressing fellow scientists at ISRO to cheers and claps after the successful launch of the country’s first solar mission – Aditya L1 – Nigar Shaji, the director of the project, said on Saturday that it was like a dream coming true.

Speaking to ANI on Saturday, Nigar Shaji said, “It feels like a dream coming true. I am extremely happy that Aditya L-1 has been injected successfully (into the designated orbit) by the PSLV. Aditya L-1 has successfully embarked on its 125-day journey.”

“As and when the Aditya L-1 fulfills all its mission objectives, it will be an asset for the country as well the global scientific community. I want to thank the entire (ISRO) team for their support and guidance in making this mission possible,” the project director of the Aditya L1 mission added.

Earlier, on Saturday, the Indian Space Research Organisation said the payload covering the Aditya L1 spacecraft was separated as it left Earth’s atmosphere following its successful launch from Sriharikota in Andhra Pradesh.

“The third stage of the separation of PSLV carrying the Aditya-L1 orbiter has been completed,” as per ISRO.

“The launch of Aditya-L1 by PSLV-C57 is accomplished successfully,” it added.

The vehicle has placed the satellite precisely into its intended orbit, the agency said, adding that the country’s first solar observatory has begun its journey to its destination – the L1 point which lies between the Earth and the Sun.

The PSLV-C57.1 rocket, carrying the Aditya-L1 payloads, lifted off successfully from the Satish Dhawan Space Centre in Sriharikota at 11.50 am on Saturday.

The Aditya-L1 mission is expected to reach the observation point in four months. It will be placed in a halo orbit around Lagrangian Point 1 (or L1), which is 1.5 million km away from the Earth in the direction of the sun.

The successful launch of ISRO’s maiden solar mission came on the heels of the historic lunar landing mission – Chandrayaan-3.

(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)

In a significant leap for the country’s space exploration endeavours, the Indian Space Research Organisation (ISRO) on Saturday successfully launched its maiden solar mission, Aditya-L1, carrying seven payloads for a detailed study of the sun.

India’s first solar space observatory mission was launched on the Polar Satellite Launch Vehicle (PSLV) XL from the Satish Dhawan Space Centre in Sriharikota at 11.50 am. The separation of Aditya-L1 and its injection into an elliptical orbit around the Earth were successful and took about 63 minutes.

Several politicians across party lines congratulated ISRO on the successful launch of the mission and its importance for science and humanity.

President Droupadi Murmu celebrated the significant milestone as a “historic feat,” underscoring its contribution to expanding our understanding of outer space. She conveyed her sincere congratulations to the dedicated ISRO scientists and engineers for their outstanding achievement and offered her utmost support for the mission’s prosperous outcome.

“The launch of Aditya-L1, India’s first solar mission, is a landmark achievement that takes India’s indigenous space programme to a new trajectory. It will help us better understand space and celestial phenomena. I congratulate the scientists and engineers at ISRO for this exceptional feat. My best wishes for the success of the mission,” President Murumu said.

The launch of Aditya-L1, India’s first solar mission, is a landmark achievement that takes India’s indigenous space programme to a new trajectory. It will help us better understand space and celestial phenomena. I congratulate the scientists and engineers at @isro for this…

— President of India (@rashtrapatibhvn) September 2, 2023

Appreciating the hardworking scientists responsible for this extraordinary accomplishment in India’s space exploration journey, Prime Minister Narendra Modi conveyed his confidence in India’s continued efforts to enhance our “understanding of the universe for the welfare of entire humanity.”

“After the success of Chandrayaan-3, India continues its space journey. Congratulations to our scientists and engineers at ISRO for the successful launch of India’s first Solar Mission, Aditya -L1. Our tireless scientific efforts will continue in order to develop a better understanding of the universe for the welfare of entire humanity,” PM Modi said.

After the success of Chandrayaan-3, India continues its space journey.

Congratulations to our scientists and engineers at @isro for the successful launch of India’s first Solar Mission, Aditya -L1.

Our tireless scientific efforts will continue in order to develop better…

— Narendra Modi (@narendramodi) September 2, 2023

The main opposition party in the Indian parliament, Congress, hailed the launch of Aditya-L1 as a “stupendous achievement” for India, as it shared a timeline of the mission from its conceptualization for understanding the “continuity in the ISRO saga”.

In a post in Hindi on X, the Congress said ISRO has given many opportunities to the country to be proud.

“After Chandrayaan-3, ISRO has again raised the nation’s prestige by successfully launching Aditya L-1,” the party said.

ISRO ने देश को गौरवान्वित होने के अनेक मौके दिए हैं।

चंद्रयान-3 के बाद ISRO ने आदित्य L-1 को सफलतापूर्वक लॉन्च कर फिर से देश का मान बढ़ाया है।

देश के वैज्ञानिकों की इस अभूतपूर्व उपलब्धि पर समस्त कांग्रेस परिवार को गर्व है। ISRO की पूरी टीम को शुभकामनाएं।

जय हिंद pic.twitter.com/xzyKgwxQsh

— Congress (@INCIndia) September 2, 2023

The entire Congress family is proud of this unprecedented achievement of the country’s scientists, it said.  Best wishes to the entire ISRO team, the party added.

In a post on X, Congress general secretary Jairam Ramesh said, “Today’s launch of Aditya-L1 is another stupendous achievement of ISRO and for India!” “While saluting ISRO once again, it is worthwhile recalling the recent timeline for Aditya-L1 to understand the continuity in the ISRO saga,” he said.

Today’s launch of Aditya-L1 is another stupendous achievement of ISRO and for India!

While saluting ISRO once again, it is worthwhile recalling the recent timeline for Aditya-L1 to understand the continuity in the ISRO saga.

2006: Scientists with the Astronomical Society of…

— Jairam Ramesh (@Jairam_Ramesh) September 2, 2023

According to ISRO, Aditya-L1 is the first space-based observatory to study the Sun. The spacecraft, after travelling about 1.5 million km from the Earth over 125 days, is expected to be placed in a Halo orbit around the Lagrangian point L1 which is considered closest to the Sun.

(With inputs from agencies)

For launching its Aditya-L1 mission on September 2, the Indian Space Research Organisation (ISRO) will be using a variant of the Polar Satellite Launch Vehicle (PSLV) which also launched India’s first missions to the moon and Mars.

With the PSLV-C57/Aditya-L1 mission, India’s first solar mission, the PSLV-XL variant will mark its 25th flight.

Read more here

Preparations in the final phase for the launch of PSLV-C57/Aditya-L1 Mission.
| Photo Credit: PTI

The countdown for the launch of India’s first solar observatory mission, Aditya-L1 has commenced at the Satish Dhawan Space Centre in Sriharikota.

“The countdown leading to the launch at 11:50 Hrs. IST on September 2, 2023 has commended,” ISRO posted on X (formerly Twitter).

The Aditya-L1 spacecraft is scheduled to be launched by the Polar Satellite Launch Vehicle (PSLV) on September 2, 2023, at 11:50 a.m. from Sriharikota.

This is the 59th flight of the PSLV and the 25th mission using the PSLV-XL configuration.

The PSLV will launch Aditya-L1 spacecraft in a highly eccentric Earth bound orbit.

According to ISRO the spacecraft shall be placed in a halo orbit around the Lagrange point 1 (L1) of the Sun-Earth system, which is about 1.5 million km from the Earth.

“A satellite placed in the halo orbit around the L1 point has the major advantage of continuously viewing the Sun without any occultation/eclipses. This will provide a greater advantage of observing the solar activities and its effect on space weather in real time. The spacecraft carries seven payloads to observe the photosphere, chromosphere and the outermost layers of the Sun (the corona) using electromagnetic and particle and magnetic field detectors. Using the special vantage point L1, four payloads directly view the Sun and the remaining three payloads carry out in-situ studies of particles and fields at the Lagrange point L1, thus providing important scientific studies of the propagatory effect of solar dynamics in the interplanetary medium,” states the Aditya L1 mission profile.

The suits of Aditya L1 payloads are expected to provide the most crucial information to understand the problem of coronal heating, coronal mass ejection, pre-flare and flare activities and their characteristics, dynamics of space weather, propagation of particles and fields etc.

The seven payloads onboard the satellite is Visible Emission Line Coronagraph(VELC), Solar Ultraviolet Imaging Telescope (SUIT), Solar Low Energy X-ray Spectrometer (SoLEXS), High Energy L1 Orbiting X-ray Spectrometer(HEL1OS), Aditya Solar wind Particle Experiment(ASPEX), Plasma Analyser Package For Aditya (PAPA) and Advanced Tri-axial High Resolution Digital Magnetometers.

The launch of Aditya-L1 comes days after the space agency created history making India only the fourth country to successfully land on the moon and first to land near the lunar south pole.

Aditya L1 onboard the PSLV-C57 the Satish Dhawan Space Centre in Sriharikota on September 1, 2023 on the eve of its launch. Photo: X/@ISRO via PTI

India’s first solar observatory mission, named Aditya-L1, will be launched onboard the Polar Satellite Launch Vehicle (PSLV) from the Satish Dhawan Space Centre in Sriharikota at 11.50 am on Saturday.

On Friday, the Indian Space Research Organisation (ISRO) commenced the 23-hour 40-minute countdown for the launch of the Aditya-L1 mission.

Approximately sixty-three minutes after liftoff, the satellite separation is expected to take place as the PSLV will launch the Aditya-L1 spacecraft into a highly eccentric earth-bound orbit at around 12.53 pm.

This PSLV-C57/Aditya-L1 mission can be counted as one of the longest missions involving ISRO’s workhorse launch vehicle. However, the longest of the PSLV missions is still the 2016 PSLV-C35 mission which was completed two hours, 15 minutes and 33 seconds after lift-off.

Long journey

Following the launch, Aditya-L1 will stay in earth-bound orbits for 16 days, during which it will undergo five manoeuvres to gain the necessary velocity for its journey.

“Subsequently, Aditya-L1 undergoes a Trans-Lagrangian1 insertion manoeuvre, marking the beginning of its 110-day trajectory to the destination around the L1 Lagrange point. Upon arrival at the L1 point, another manoeuvre binds Aditya-L1 to an orbit around L1, a balanced gravitational location between the Earth and the Sun,” ISRO said.

Aditya-L1 will stay approximately 1.5 million km away from the earth, directed towards the sun; this is about 1% of the distance between the earth and the sun.

Studying the solar corona

The Aditya L-1 payloads are expected to provide crucial information to understand the problem of coronal heating, coronal mass ejection, pre-flare and flare activities and their characteristics, dynamics of space weather, propagation of particles and fields etc.

The seven payloads onboard the satellite are: Visible Emission Line Coronagraph (VELC), Solar Ultraviolet Imaging Telescope (SUIT), Solar Low Energy X-ray Spectrometer (SoLEXS), High Energy L1 Orbiting x-ray Spectrometer (HEL1OS), Aditya Solar wind Particle Experiment (ASPEX), Plasma Analyser Package for Aditya (PAPA), and Advanced Tri-axial High Resolution Digital Magnetometers.

The primary payload is VELC, which was developed by the Indian Institute of Astrophysics (IIA), Bengaluru and is designed to study the solar corona and the dynamics of coronal mass ejections.

The Aditya-L1 satellite placed in the halo orbit around the L1 point has a major advantage of continuously viewing the sun without any occultation or eclipse. It is expected to provide a greater advantage in observing the solar activities continuously.

Tracking solar quakes

“There are certain activities which take place around the sun which we call solar quakes. In the aftermath of these solar quakes, a lot of energetic material from the sun is thrown out. Some of them can be directed towards the earth and they can travel at a maximum speed of 3,000 km per hour and reach the near-earth space within 15 hours,” Ramesh R., the principal investigator of the VELC payload, told The Hindu.

Prof. Ramesh added that once the energetic material reaches the earth, it may not cause any physical damage, but it does have the capability to cripple life on earth.

“Our present-day life scenario depends very much on the stationary satellites which are parked in space be it for our internet connectivity, cell phone or TV connectivity. These charged particle clouds can engulf the satellites and damage all the electronics on board the satellites. Hence, we do not know when the solar quakes will happen, it can happen any time of the day so it is very essential to observe the sun on a 24-hour basis and carry out observations,” Prof. Ramesh added.

The rehearsal for the launch of the PSLV-C57/Aditya-L1 Mission, the first space-based Indian observatory to study the sun, is completed, in Sriharikota on August 30.
| Photo Credit: ANI

Visible Emission Line Coronagraph (VELC), the primary payload on board India’s first dedicated scientific mission to study the sun, Aditya-L1, will be sending 1,440 images of the sun every day to ground stations.

VELC, developed by the Indian Institute of Astrophysics (IIA), Bengaluru, will be able to observe the corona continuously from the Lagrange point 1 (L1) of the sun-earth system, which is about 1.5 million km from the earth.

Also Read | Smooth operation of LAM engine critical to Aditya-L1 success

Aditya-L1 is scheduled to be launched by the ISRO on September 2 at 11.50 a.m. from the Satish Dhawan Space Centre in Sriharikota.

“Though Aditya L1 mission will be launched on September 2 there will be a cruise phase of 100 plus days before it reaches the L1 point. Once it reaches that point, the doors will be open from most likely from the first week of January 2024 and we will make continuous observations for using the VELC payload,” Ramesh. R, principal investigator of the VELC payload, told The Hindu.

Prof. Ramesh added that the VELC payload would be sending 1,440 images of the sun in a day.

Voluminous data

“The VELC payload has been designed in such a way that every one minute we will be getting an image of the sun and we will be getting 1,440 images per day to monitor the activities of the sun. With so much data, the ground segment should be ready to process these images in real time and within a turnaround time of 24 hours these should be sent back to ISRO so that the data are disseminated to the scientific community and the public,” Prof. Ramesh said.

Also Read | India’s SpaceTech transformation is credited to privatisation

He said the IIA along with the ISRO centres was ready to handle such voluminous data as all systems were in place.

“We need tremendous computing power for which the IIA is ready and all the software are being tested so that with the minimum overlap time the data from the spacecraft will be downloaded at the Indian Deep Space Network in Bylalu from where they will process the L0 data [Level 0] data and send them to the payload operations centre in the IIA which will be processed within 24 hours and sent back to the Indian Space Science Data Centre for dissemination,” Prof. Ramesh said.

Apart from the VELC payload, there would be six other payloads on board the Aditya L1 whose mission life was five years.

IIA Director Annapurni Subramaniam said the VELC payload was the most important payload on the spacecraft.

“The spacecraft sitting at L1 will take pictures of the sun in various ways so that you can understand more about the properties of the sun as well as the surrounding corona. VELC is a very complex instrument to look at very specific spectral lines,” Prof. Annapurni Subramaniam said.